Despite their impressive cognitive abilities, avian species have shown less evidence for metacognition than mammals. We suspect that commonly used tasks such as matching to sample might be too demanding to allow metacognitive processing within bir...
The present study investigated how budgerigars and humans perceive a version of the Delboeuf illusion. In Experiment 1, we trained 4 budgerigars to discriminate between the sizes of two square targets, one of which was embedded in a concentric squ...
Retinotopic encoding is preserved in primate visual cortex. However, several physiological and psychophysical studies have revealed that visual processes can be disengaged from retinotopic coordinates. We examined whether this non-retinotopic proc...
A disk surrounded by smaller disks looks larger, and one surrounded by larger disks looks smaller than reality. This visual illusion, called the Ebbinghaus-Titchener illusion, remains one of the strongest and most robust illusions induced by contr...
Seeking information in uncertain situations has been interpreted as evidence of metacognitive abilities. We examined whether pigeons could monitor their own knowledge states and seek new information when in need. In Experiment 1, we required the p...
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